# FM Synthesizer – Piano Keys — user reviews

> 4 indexed App Store user reviews of FM Synthesizer by Stanislav Duplinskiy, rated 1.67/5 from 6 ratings.

- Source: https://appshunter.io/ios/app/fm-synthesizer-piano-keys/id1563962952/reviews
- App overview in markdown: https://appshunter.io/ios/app/fm-synthesizer-piano-keys/id1563962952.md
- Rating breakdown: 5★ 1 · 4★ 0 · 3★ 0 · 2★ 0 · 1★ 5

## Most critical reviews (4 lowest-rated)

### 1/5 — Awful

*2024-10-22*

Don’t waste your time with this one.

**Developer response:** Hello, Kennyvert! I’m sorry to hear the app didn’t meet your expectations. Our goal is to offer a unique FM Synthesizer experience, with versatile presets and detailed waveform controls. If there’s any specific feature or improvement you’d like to see, please feel free to share. We’re always looking to enhance the app and make it more enjoyable for users.

### 1/5 — Don’t believe in renting apps

*2023-08-21*

And neither should you as a consumer,

**Developer response:** Hi, zyberpunk!

Thank you very much for your feedback, it is important to us.
We really had difficulty releasing updates and had to rewrite the engine.
Everything will be ready soon.
We are sorry that you had a negative experience.
We are working on updates.

Best regards, Castles Trip

### 1/5 — Doesn't work

*2021-12-14*

Tapping the keys does absolutely nothing. The control knobs turn, but I never got it to make a single sound. And almost everything you tap brings up a screen asking you to "subscribe".  Subscribe to what? A broken app?

**Developer response:** Thank you for your feedback!
We will be very grateful if you report the version of the application, the version of the axis on which you noticed this problem and the device.
We will definitely check and fix this error!

To contact us, we ask you to write a letter to castles.trip.spprt@gmail.com.

### 5/5 — Cool app

*2023-10-23*

I’m really enjoying this app

**Developer response:** Hello!
Thank you for your feedback :)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-17.*